drm/amdgpu/gfx9: clear the compute ring on reset

To be consistent with gfx8.
Reviewed-by: monk liu <monk.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -2149,6 +2149,7 @@ static int gfx_v9_0_kiq_init_queue(struct amdgpu_ring *ring)
 
 		/* reset ring buffer */
 		ring->wptr = 0;
+		amdgpu_ring_clear_ring(ring);
 
 		if (is_kiq) {
 		    mutex_lock(&adev->srbm_mutex);